CN108895108A - A kind of more born of the same parents' configurations of auxetic and endergonic structure component - Google Patents
A kind of more born of the same parents' configurations of auxetic and endergonic structure component Download PDFInfo
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- CN108895108A CN108895108A CN201810809469.8A CN201810809469A CN108895108A CN 108895108 A CN108895108 A CN 108895108A CN 201810809469 A CN201810809469 A CN 201810809469A CN 108895108 A CN108895108 A CN 108895108A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
- F16F7/128—Vibration-dampers; Shock-absorbers using plastic deformation of members characterised by the members, e.g. a flat strap, yielding through stretching, pulling apart
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Abstract
The invention discloses a kind of more born of the same parents' configurations of auxetic and endergonic structure component, including multiple single cell structures, each unit cell is to be obtained by two typical indent feature structures and two arrowhead-shaped structures by ingenious splicing；The position of the right and left indent angular vertex of indent feature structure respectively connected two arrowhead-shaped feature structures, the indent angular vertex position of the two arrowhead-shaped feature structures is connected to half of cross bar of other two indent feature structure again, collectively forms the single cell structure of the more born of the same parents' configurations of auxetic；Then the unit cell obtains the more born of the same parents' configurations of two-dimentional auxetic by planar array.The Multi-halfwaves Filters have negative poisson's ratio property, can shrink when being pressurized, to keep pressurized zone local densified, this unique deformation behaviour enables it with stronger pressure mottling resistance and shock resistance.In addition, adjusting its elastic property and incompressible intensity by the slenderness ratio and tilt angle that change bar.
Description
Technical field
The present invention relates to a kind of auxetic configuration, in particular to the more born of the same parents' configurations of a kind of auxetic and endergonic structure component.
Background technique
Compared with traditional positive Poisson ratio material, negative poisson's ratio material can generate contraction perpendicular to compression direction, this is just
Mean reinforce geometric effect, the particle or fiber of pressurized zone can generate it is local densified, make material have higher pressure
Contracting impedance, resistance to compression trace ability, shear resistance and compressive strength have greatly application latent in packaging and damping, buffering design
Power.Studies have shown that negative poisson's ratio characteristic can also generate higher fracture toughness and acoustic damping etc..In addition, negative poisson's ratio to bear
Poisson's ratio cellular sandwich outside face by it is curved when can generate hemispherical deformation, can be used for making bending axisymmetrical laminated shell, such as be used for aviation
The radome fairing etc. of rocket or aircraft in space flight.Therefore, from the angle of basic research and practical application, these non-traditional materials are studied
Material is particularly important, especially in medicine, aviation and national defense industry, such as the pyrolytic graphite for aviation field thermal protection, boat
The monocrystalline Ni of empty engine3Al etc..
Auxetic materials have many excellent performances, however auxetic materials also have limitation in some aspects.Due to majority
Auxetic materials need a large amount of hole, and the rigidity of auxetic materials is more much lower than the material stiffness for forming its structure, this is but also draw
Application of the swollen material in engineering component is restricted.The stability and bearing capacity of auxetic structure all have not been reached yet desired
Level, structural stability and bearing capacity how are improved while guaranteeing auxetic performance becomes a hot spot of research.
Summary of the invention
Technology of the invention solves the problems, such as：The shortcomings that overcoming above-mentioned existing more born of the same parents' configurations and deficiency propose that a kind of auxetic is more
Born of the same parents' configuration and endergonic structure component have stronger energy absorption characteristics.In addition, the elasticity such as its controllable Young's modulus and Poisson's ratio
Energy and incompressible intensity and impact energy absorption characteristics, can be designed according to different application requirements；3D printing skill can be passed through
Art is quickly prepared, and can also carry out batch preparation by traditional handicraft.Compared with classical indent configuration, which can absorb more
Energy.
The present invention is mainly achieved through the following technical solutions：A kind of more born of the same parents' configurations of auxetic, are arranged to make up, often by multiple unit cells
A unit cell is made of two indent feature structures and two arrowhead-shaped structures to form；Connect to described two arrowhead-shaped symmetrical configurations
In the apex (point G and point H) of the two interior re-entrant angles in left and right of most intermediate indent feature structure；Described two arrowhead-shaped structure indents
The apex (point F and point I) at angle respectively connected half of cross bar of other two indent feature structure again；
The indent feature structure is symmetrical and symmetrical above and below, by symmetry it is found that indent feature structural integrity list
The a quarter of born of the same parents, which is passed sequentially through, forms a complete indent feature structural integrity unit cell, indent in x-axis and y-axis symmetry arrangement
The a quarter of the complete unit cell of feature structure is separately connected half root horizontal cross bar by a brace both ends and constitutes；Indent feature structure
Can be h by the length of horizontal cross bar, the length of tilting bar is that angle theta between l and horizontal cross bar and tilting bar uniquely determines,
Angle theta between horizontal cross bar and tilting bar is less than 90 °；
The arrowhead-shaped structure is in symmetrical above and below, and the arrowhead-shaped structure is by two about x-axis mirror symmetry and one end phase
Stock even and two are about x-axis mirror symmetry and quarter butt that one end is connected is constituted, and the other end of stock is connected to the another of quarter butt
One end, the arrowhead-shaped structure by shorter tilting bar length be l, longer brace and x-axis angle α and shorter brace
It is uniquely determined with the angle theta of x-axis, α and θ are respectively less than 90 °, and α is always less than θ.
When the splicing indent feature structure and arrowhead-shaped structure, the wherein length of indent feature structures slope bar and wherein
The length of the arrowhead-shaped shorter tilting bar of structure is identical；Folder between the horizontal cross bar and tilting bar of indent feature structure in unit cell
Angle and wherein the shorter tilting bar of arrowhead-shaped structure is equal with the angle of x-axis；
The multiple unit cell is in the arrangement mode of array with vertical direction in the horizontal direction, to obtain the more born of the same parents' structures of auxetic
Type.
The arrangement mode of the array obtains the new configuration of the more born of the same parents of two-dimentional auxetic when for planar periodic arrangement.
The unit cell of the more born of the same parents' configurations of each two-dimentional auxetic obtains the unit cell of the more born of the same parents' configurations of three-dimensional auxetic by spatial variations；
Then again by way of space array, the periodic arrangement on the direction of three, space obtains the unit cell of the more born of the same parents' configurations of three-dimensional auxetic
To the more born of the same parents' configurations of three-dimensional auxetic.
The angle α and θ are respectively less than 90 °, and α is always less than θ.
The cross section of horizontal cross bar or tilting bar in auxetic structure be annular, I-shaped, flute profile or polygon, it is described more
Side shape includes rectangle, square, diamond shape, circle, ellipse, triangle or trapezoidal, preferably annular, I-shaped or flute profile.
The more born of the same parents' configurations of auxetic, are prepared by 3D printing technique, and the 3D printing technique is that photocuring solid is made
Type technology, fused glass pellet technology, selective laser melting process or the net forming technique of laser.
The more born of the same parents' configuration materials of auxetic are plastics or metal；It is prepared by traditional handicraft, the traditional handicraft is
First sheet metal pressure is formed, then is pasted or is welded to prepare；Or it is processed by milling.
The porosity very little of the more born of the same parents' configurations of auxetic, can reach 99% or more.
A kind of endergonic structure component is realized using the above-mentioned more born of the same parents' configurations of auxetic.
By changing the slenderness ratio and angle α of horizontal cross bar or tilting bar and the size of θ, elastic property, resistance to compression are adjusted
Contracting intensity or impact energy absorption characteristics, the elastic property includes Young's modulus and Poisson's ratio；The Poisson's ratio is only considering elasticity
Always negative value when the static stretch of performance and compression, and the Poisson's ratio of x, y both direction is negative value.
The present invention has the following advantages that and effect relative to existing configuration：
The invention proposes a kind of more born of the same parents' configurations of auxetic and endergonic structure component, the configuration planar in both direction all
With Negative poisson's ratio, can be shunk when being pressurized, thus keep pressurized zone local densified, this unique deformation behaviour
Enable it that there are the advantages such as stronger pressure mottling resistance and shock resistance compared with traditional positive Poisson ratio material, in damping, buffering
Design aspect has great application prospect.
The elastic properties of the more born of the same parents' configurations of the auxetic, incompressible intensity and impact energy absorption characteristics etc. be it is controllable, pass through adjusting
The tilt angle (α and θ) of the length of horizontal cross bar or tilting bar, cross section and tilting bar, so that it may obtain different elasticity
Energy, incompressible intensity and impact energy absorption characteristics.Elasticity modulus, incompressible intensity and impact energy absorption characteristics mainly have with relative density
It closes, Poisson's ratio is main related with geometric dimension.In addition, impact energy absorption characteristics are also closely related with impact velocity.
The porosity of the more born of the same parents' configurations of the auxetic can achieve 99% or more, and lighting may be implemented.Can not only it lead to simultaneously
Printing for 3D printing technique fast accurate is crossed, batch micro operations can also be carried out by traditional handicraft.
Detailed description of the invention
Fig. 1 is the endergonic structure block diagram of the more born of the same parents' configurations of auxetic of the invention；
Fig. 2 is the single cell structure schematic diagram of Fig. 1 structure；
Fig. 3 is classical concave inward structure schematic diagram；
Fig. 4 is the single cell structure schematic diagram of Fig. 3 structure；
Fig. 5 is double-head arrow type structural schematic diagram；
Fig. 6 is the single cell structure schematic diagram of Fig. 5 structure；
Fig. 7 is the unit cell of the more born of the same parents' configurations of three-dimensional auxetic in spatial linear array schematic diagram；
Fig. 8 is the single cell structure schematic diagram of Fig. 7 structure；
Fig. 9 is the two-dimensional structure of the new configuration of the more born of the same parents of auxetic of the present invention and classical indent knot in the identical situation of relative density
Structure load-deformation curve comparison diagram.
Specific embodiment
Further specific detailed description is made to the present invention combined with specific embodiments below.
As shown in Figure 1, the present invention is a kind of endergonic structure component based on the more born of the same parents' configurations of auxetic, basic component units are
A two-dimentional single cell structure as shown in Figure 2, the unit cell include centrally located indent feature structure (B-G-L-M-H-C),
The identical arrowhead-shaped feature structure (A-F-K-G and D-H-N-I) of the concave inward structure the right and left two, and with the two arrows
Affixed each half of concave inward structure unit cell (A-F-E-K and D-I-J-N) of type structure indent angular vertex (point F and point I).The more born of the same parents of auxetic
The unit cell of configuration keep constituting its concave inward structure and arrowhead-shaped structure basic structural feature, wherein more born of the same parents' configuration unit cells of auxetic
In indent feature structure level cross bar and tilting bar between angle and its arrowhead-shaped structure shorter tilting bar and x-axis angle
Should be equal, and α and θ are respectively less than 90 °, and α is always less than θ.The cross section of each bar can be rectangular there are many selection in unit cell
The polygons such as shape, square, circle, ellipse, triangle, trapezoidal, are also possible to annular, I-shaped, flute profile.It is single by changing
The slenderness ratio and angle [alpha] of bar and the size of θ in born of the same parents, i.e., the adjustable elastic properties such as Young's modulus and Poisson's ratio and resistance to compression
Contracting intensity and impact energy absorption characteristics.
If Fig. 7 is the more born of the same parents' configurations of three-dimensional auxetic, basic component units are one as shown in Figure 8 three-dimensional single cell structure, should
Unit cell includes the unit cell 1 and 2 of two new configurations of the identical two-dimentional more born of the same parents of auxetic, and the unit cell of two new configurations of the two-dimentional more born of the same parents of auxetic exists
It is overlapped at node E, F, G, H, I and J and affixed, and shares a symmetry axis 3；The unit cell 1 of two new configurations of the two-dimentional more born of the same parents of auxetic
Space angle β with 2 is 90 °.Three-dimensional auxetic unit cell carries out parallel array in the x and y direction, obtains one layer of structure, then again
Stacked array is carried out in a z-direction, so that it may obtain the array structure of periodic arrangement in the x, y and z directions.It only arranges herein
A kind of spatial arrangement form is enumerated, other arrangement forms are also encompassed within interior.The new configuration of the more born of the same parents of the three-dimensional auxetic can pass through light
Solidify the 3D printings skills such as three-dimensional contouring technology, fused glass pellet technology, selective laser melting process and the net forming technique of laser
Prepared by art, material is mainly plastics and metal.
As shown in figure 9, having carried out quasistatic compression numerical simulation in the x-direction to the new configuration of the more born of the same parents of the two dimension auxetic.Unit cell
Specific size be：L=5mm, h=5mm, α=30 °, θ=60 °.The cross section of the new configuration of the more born of the same parents of auxetic and classical concave inward structure
For rectangle, face outside direction is an element length, and guarantees that the relative density of the two is 0.1.The more born of the same parents of auxetic of the invention
Configuration unit cell carries out parallel array in the x and y direction, and finite element model is in the total length in the direction x and the total height difference in the direction y
For 150mm and 130mm；Classical concave inward structure finite element model is respectively in the total length in the direction x and the total height in the direction y
135mm and 121mm.Its load-deformation curve is as shown in Figure 9 after compression.It can be seen that the more born of the same parents' configurations of two-dimentional auxetic of the invention
There is when quasistatic compression apparent two-part plateau stress in the x-direction, compared with classical concave inward structure, be more advantageous to resistance pressure
Contracting load, the absorbent energy of institute are also more.
It as shown in Figure 3,4, is classical indent feature structure and its single cell structure.The unit cell of classical indent feature structure is in a left side
It is right symmetrically and symmetrical above and below, by symmetry it is found that a quarter of indent feature structural integrity unit cell is passed sequentially through in x-axis and y
Axial symmetry arrangement one complete indent feature structural integrity unit cell of composition, a quarter of indent feature structural integrity unit cell by
A piece brace both ends are separately connected half root horizontal cross bar composition；Indent feature structure can be h, tilting bar by the length of horizontal cross bar
Angle theta of the length between l and horizontal cross bar and tilting bar uniquely determine, the angle theta between horizontal cross bar and tilting bar
Less than 90o.
It as shown in Figure 5,6, is arrowhead-shaped structure and its single cell structure.The unit cell of arrowhead-shaped structure is in symmetrical above and below, by two
Root is constituted about the x-axis mirror symmetry stock that simultaneously one end is connected and two about the x-axis mirror symmetry quarter butt that simultaneously one end is connected, length
The other end of bar is connected to the other end of quarter butt, and the arrowhead-shaped structure is l, longer brace by the length of shorter tilting bar
It is uniquely determined with the angle theta of the angle α of x-axis and shorter brace and x-axis, α and θ are respectively less than 90o, and α is always less than θ.
Embodiment of the present invention are not limited by the above embodiments, other are any without departing from Spirit Essence of the invention
With changes, modifications, substitutions, combinations, simplifications made under principle, equivalent substitute mode should be, be included in of the invention
Within protection scope.
Claims (10)
1. a kind of more born of the same parents' configurations of auxetic, it is characterised in that：The more born of the same parents' configurations of auxetic are arranged to make up by multiple unit cells, each unit cell
It is made of two indent feature structures and two arrowhead-shaped structures to form；It is connected in most to described two arrowhead-shaped symmetrical configurations
Between indent feature structure the two interior re-entrant angles in left and right apex；The apex of re-entrant angle is distinguished again in described two arrowhead-shaped structures
It is connected to half of cross bar of other two indent feature structure；
The indent feature structure is symmetrical and symmetrical above and below, by symmetry it is found that indent feature structural integrity unit cell
A quarter, which is passed sequentially through, forms a complete indent feature structural integrity unit cell, indent feature in x-axis and y-axis symmetry arrangement
The a quarter of structural integrity unit cell is separately connected half root horizontal cross bar by a brace both ends and constitutes；Indent feature structure is by water
The length of flat cross bar is h, the length of tilting bar is that angle theta between l and horizontal cross bar and tilting bar uniquely determines, horizontal horizontal
Angle theta between bar and tilting bar is less than 90 °；
The arrowhead-shaped structure is in symmetrical above and below, and the arrowhead-shaped structure is by two about x-axis mirror symmetry and one end is connected
Stock and two are constituted about the connected quarter butt of x-axis mirror symmetry and one end, and the other end of stock is connected to the other end of quarter butt,
The arrowhead-shaped structure is l, the angle α of longer brace and x-axis and shorter brace and x-axis by the length of shorter tilting bar
Angle theta uniquely determine, α and θ are respectively less than 90 °, and α is always less than θ.
When the splicing indent feature structure and arrowhead-shaped structure, the wherein length of indent feature structures slope bar and wherein arrow
The length of the shorter tilting bar of type structure is identical；Angle between the horizontal cross bar and tilting bar of indent feature structure in unit cell and
Wherein the shorter tilting bar of arrowhead-shaped structure is equal with the angle of x-axis；
The multiple unit cell is in the arrangement mode of array with vertical direction in the horizontal direction, to obtain the more born of the same parents' configurations of auxetic.
2. the more born of the same parents' configurations of a kind of auxetic according to claim 1, it is characterised in that：The arrangement mode of the array when for
When plane periodically is arranged, the new configuration of the more born of the same parents of two-dimentional auxetic is obtained.
3. the more born of the same parents' configurations of a kind of auxetic according to claim 2, it is characterised in that：The more born of the same parents' configurations of each two-dimentional auxetic
Unit cell obtain the unit cell of the more born of the same parents' configurations of three-dimensional auxetic by spatial variations；Then the unit cell of the more born of the same parents' configurations of three-dimensional auxetic passes through again
The mode of space array, the periodic arrangement on the direction of three, space obtain the more born of the same parents' configurations of three-dimensional auxetic.
4. the more born of the same parents' configurations of a kind of auxetic according to claim 1 or 2, it is characterised in that：The angle α and θ are respectively less than
90 °, and α is always less than θ.
5. the more born of the same parents' configurations of a kind of auxetic according to claim 1 or 2, it is characterised in that：Horizontal cross bar in auxetic structure
Or the cross section of tilting bar be annular, I-shaped, flute profile or polygon, the polygon include rectangle, square, diamond shape,
Round, ellipse, triangle or trapezoidal, preferably annular, I-shaped or flute profile.
6. the more born of the same parents' configurations of a kind of auxetic according to claim 1 or 2, it is characterised in that：The more born of the same parents' configurations of auxetic, pass through
It is prepared by 3D printing technique, the 3D printing technique be stereolithography technology, fused glass pellet technology, constituency swash
Light smelting technology or the net forming technique of laser.
7. the more born of the same parents' configurations of a kind of auxetic according to claim 1 or 2, it is characterised in that：The more born of the same parents' configuration materials of auxetic
For plastics or metal；It is prepared by preparation process, then is pasted or welded；Or it is processed by milling.
8. the more born of the same parents' configurations of a kind of auxetic according to claim 1 or 2, it is characterised in that：The hole of the more born of the same parents' configurations of auxetic
Gap rate very little, can reach 99% or more.
9. a kind of endergonic structure component, it is characterised in that：Using claim 1-8 it is one of any described in the more born of the same parents' configurations of auxetic it is real
It is existing.
10. endergonic structure component according to claim 9, it is characterised in that：By changing horizontal cross bar or tilting bar
The size of slenderness ratio and angle α and θ adjusts elastic property, incompressible intensity or impact energy absorption characteristics, the elastic property
Including Young's modulus and Poisson's ratio；The Poisson's ratio is only considering the static stretch of elastic property and always negative value when compression, and
X, the Poisson's ratio of y both direction is negative value.
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